The Overtone Whistle is gaining popularity in many circles. The 2 most popular are the Scandinavian “Seljefloyte” or willow whistle and the Slovakian “Fujara” or contrabass Tabor Pipe. Here are some U-tube clips
Not my tastes. For those who like it, I am sure it is great, but to me it sounds like any number of “fusion chill” type recordings…all you need is a rain stick, thunder noises, or crashing waves. Not to self: avoid anything with “fusion” in the description.
I do agree that the whistle belongs in music other than IT, or “celtic” music, but as far as I know, it already is. The whistle can be found in country, popular, contemporary christian, and several other idioms.
Funny thing…I thought it said “Overton” in the heading, and was excited to hear something new! Devil is in the details.